Question

Crossing over occurs between which one of the following?
a. Non – homologous chromatids of non-homologous chromosomes
b. Non – sister chromatids of homologous chromosome
c. Sister chromatids of homologous chromosomes
d. Sister chromatids of a non-homologous chromosome
Please tell me the correct option.

Answer 1

Answer:

Non - sister chromatids of homologous chromosome

Answer 2

B. Non – sister chromatids of homologous chromosome

is the Correct Answer dear.

Chromosomal crossover, or crossing over, is the exchange of genetic material during sexual reproduction between two homologous chromosomes' non-sister chromatids that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs in the pachytene stage of prophase I of meiosis during a process called synapsis. Synapsis begins before the synaptonemal complex develops and is not completed until near the end of prophase I. Crossover usually occurs when matching regions on matching chromosomes break and then reconnect to the other chromosome.

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